Remember these are people who know what it's like to go through apartheid and ethnic cleansing.
South Africa today is largely governed by the people who fought and won against apartheid, so it's understandable that they feel a level of solidarity with the people of Palestine.
(in this context I'm choosing to gloss over the real and present issues with the ANC, because they are not relevant to Israel's genocide)
So then... continue using exclusively Apple's store then?
If you consider Apple to be the gold standard for security, you have just keep going as you are.
I don't see how giving other people the freedom to choose infringes on your security.